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Preparation and properties of the composite coatings of poly(L-lactic acid) with MgO or Mg(OH)2 on medical magnesium surface
Pages: 446-450
Year: Issue:  10
Journal: Electroplating & Finishing

Keyword:  magnesiumpolylactic aciddip coatingmagnesium oxidemagnesium hydroxidecomposite;
Abstract: The surface modification of magnesium alloys by bio-degradable polymer matrix composites for biomedical applications was studied to improve both corrosion resistance and surface biocompatibility of magnesium under physiological conditions. A poly(L-lactic acid) (PLLA) coating was formed on high-purity magnesium substrate with epichlorohydrin and acetone as solvent, and two PLLA matrix composite coatings were prepared with MgO and Mg(OH)2 as reinforcement respectively. The comprehensive performances of the coatings were evaluated by scanning electron microscopy, rapid corrosion resistance test, coating/substrate adhesion test, potentiodynamic polarization measurement, and in vitro biodegradation behavior studies. The results showed that adding an appropriate amount of MgO or Mg(OH)2 as reinforcement can improve the resistance of PLLA coating to degradation in Hank’s simulated body fluid, and reduce the acidification during the dissolution of PLLA.
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